How can I merge a JIRA cloud instance with an existing populated JIRA server instance without losing already existing data which is already in use?

I'm trying to consolidate JIRA. We have an ondemand instance that we have used for part of the company, and a JIRA server instance for another part of the company . We want to import our cloud instance (not per project, but everything) into our local JIRA server instance. I want to make sure nothing gets messed up with the existing JIRA server projects and without lose of any existing data with this migration. Is this possible or do I need to do it 1 project at a time?

Please suggest me what is the best approach to follow in this scenario.

Thanks Jobin for your quick response and suggestion,For example if i have 100 projects on my cloud instance, at that time if i merge project by project it will take lot of time .So is there any other way to restore complete backup without losing existing data on JIRA server instance which is already in use?

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Thanks jobin for your extended support,as you said restore one project at a time, if i use project import tool to import backup, it missed some configuration like workflow schemes ,issue schemes, field configuration scheme and etc.

When i am come across the some online Atlassian documents and posts , i have observed the following steps and heard about the Project Configurator plugin.

Here is my understandings are correct? Please correct me if i am wrong or any thing missed here and suggest me with correct procedure.

EX:

I have a Jira-A cloud instance which is having ,say 50 projects.

1.I will create backup file.2.I will install the new JIRA-B Server instance.3.I will restore the backup in to JIRA-B.4.I have one more existing Jira server instance called JIRA-C5.Now i will create backup file of JIRA-B.6.created one backup file using project configurator pulgin.(which will be used to export/import configurations).7.Now first i will import configurations into JIRA-C by using project Cofigurator plugin.8.after that i will import JIRA-B backup data (xml) file into JIRA-C by using project import tool which is give by atlassian.

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